Synthesis Of RGO-Ni₃S₂ And Co²⁺ Doped On RGO Based Porous Polymer For Supercapacitors

As a new multi-functional materials has been extensively studied, graphene is already being used in electrochemical sensors, field effect transistors, energy storage and conversion due to its unique properties such as high specific surface area, high conductivity, low cost, high stability and excellent mechanical properties. At present, graphene is used more and more widely in supercapacitor. The porous graphene material can be more conducive to electrolyte infiltration, resilient porous three-dimensional skeleton structure during charge and discharge in favor of the charge transport and storage, but also to the material in the charge-discharge process showed better stability. Graphene currently used mostly by reducing graphene oxide through the preparation, during the restore process, due to the large electrostatic force between the graphene oxide sheets, hydrogen bonding and ?-? bond and so on, graphene can sheets easily agglomeration, thus greatly reducing the graphene surface area, which will hinder the infiltration and transport of electrons electrolyte. By loading other materials on graphene to prepared graphene-based composites can greatly weaken the interaction force between the graphene help form a porous structure.This paper uses two strategies:(1) Ni3S2 has high theoretical specific capacity, but prone to agglomeration in the preparation process. Pure Ni3S2 material has low electrical conductivity, thereby reducing its super capacitor performance. We use hydrothermal reaction and heat treatment method to prepare a three-dimensional porous rGO-Ni3S2 composites, in which the Ni3S2 uniformly supported on the graphene surface,. Meanwhile, in the promotion of F127 polymer, NJ3S2 self-assembly has become a special flower-like structure. The resulting composite material has high specific capacity and charge-discharge performance stability.(2) By using the method of modificitation of the graphene oxide surface, we succeeded preparing polymerizing graphene on the surface of polyethylene benzyl chloride, and then by a nucleophilic substitution reaction of the cobalt ion complexation 5,10,15,20-tetra (4-pyridyl) porphyrin connected on polyethylene benzyl chloride, finally we received nitrogen-doped Co2+ in 2D highly crosslinked complex composites, and exhibited excellent performance.